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Single Family ResidenceResidential
$1,638,853$712 / ft²
TopHap EstimateOur estimate of what this home would sell for today, based on nearby sales, the home's size and features, and local price trends. It is a starting point, not an appraisal.· confidence 95How well the pricing models agreed with each other on this home. Higher means the estimate rests on stronger, more consistent data.· as of Sep 24, 2026

21 DEAN ST

BELMONT, MA 02478
4
Beds
2.5
Baths
2,303 ft²
Living AreaTotal finished area of the structures, from county records. Some counties include shared space like hallways or a building gym, so it may not match a listing.
0.14 ac
Lot SizeThe size of the land the home sits on, from county records.
1935
Year BuiltThe year the home was originally built, according to county records.
2
StoriesHow many floors the home has above ground.
9
RoomsThe total room count in county records. Counties differ on which rooms they count, so compare it loosely.
1
ParkingThe number of parking spaces on the property, including the garage.

Valuation

$1.6M
$1.6M low$1.7M high

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$17,552 (2025)
Assessed ValueThe value the county assigns to this home to calculate property tax. It is often lower than what the home would sell for.$1,541,000 (2025)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$692,000
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$849,000
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$1,675,515

Property Facts

Property TypeThe broad category the county puts this property in, such as residential or commercial.Single Family Residence
CountyMIDDLESEX
Lot (acres)The size of the land the home sits on, from county records.0.14
ConstructionThe main material the home's frame and walls are built from.Frame (Unspecified)
RoofThe main material covering the roof, such as asphalt shingle or tile.Asphalt
HeatingThe type of heating system in the home.Forced Air With Air Conditioning
FireplaceWhether the home has a fireplace, and what kind.Yes
PoolWhether the property has a pool, and what kind, such as in-ground.No
FeaturesExtra features found in county records. Records are not complete everywhere, so a missing feature does not always mean the home lacks it.Deck

Transaction History(8)

Sales and refinances filed with the county for this home. Not every transfer is a normal sale, so check the type before comparing prices.

Assigned SchoolsThe public schools this address is zoned for. Boundaries change, so confirm with the district before you count on it.

E
Winn BrookA+
Elementary · Grades KG–3 · 0.3 mi
H
Belmont High SchoolA+
High · Grades 9–12 · 0.4 mi
M
Winthrop L Chenery Upper Elementary SchoolA-
Middle · Grades 4–6 · 0.9 mi

District: Belmont School District

Neighborhood · ZIP 02478These are comparison scores, not percentages. 100 equals the national average, so 150 means about 50% above average.

CrimeLocal crime compared with the rest of the country, where 100 is average. It reflects things like population density, income, and how crime gets reported.55
Air pollutionOverall air pollution compared with the rest of the country, where 100 is average. Lower is cleaner.103
EarthquakeEarthquake risk and likely building damage compared with the rest of the country, where 100 is average. Scores can run far above 100.74

Index scale: 100 = US average (tick). Lower is better.

Homes occupiedThe share of homes here that someone lives in. The rest sit empty, including vacation and for-sale homes.95%
Bachelor's or higherThe share of adults 25 and older whose highest degree is a bachelor's degree.28%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.3.8%
UnemploymentThe share of men 16 and older who are out of work and actively looking. Only men are counted in this figure.1.2%
PopulationHow many people live in this area.27,636
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.5,959 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$162,650
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$213,185
Average tempThe average temperature here across a full year.49°F
Annual precipHow much rain and melted snow falls here in a typical year.47 in
SunshineThe share of daylight hours that get direct sun in a typical year, counting cloud cover.58%

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Data by ATTOM. Valuations are automated estimates, not appraisals. Photos from Google Street View and may not depict the current property state.

How this home compares

21 Dean St measured against every home in its neighborhood, its ZIP code and its county, using county assessor records refreshed nightly. A home can stand out in one of those areas and look ordinary in another, because each one holds a different mix of homes.

  • Worth more than 91% of homes in Middlesex County
  • Costs more per square foot than 87% of homes in Middlesex County
  • Bigger than 68% of homes in Middlesex County
  • Has a smaller lot than 79% of homes in Middlesex County
  • Older than 66% of homes in Middlesex County

What homes are worth in Belmont 02478

Each bar is how many homes fall in that price range. The marker is this home.

This home
$587K$3.5M

This home is worth more than 64% of homes in Belmont 02478.

How it measures up in Belmont 02478

The dot is this home. The mark in the middle is the typical home in Belmont 02478.

Estimated value$1,638,853
CheaperTypical $1,461,644Pricier

Pricier than 64% of homes nearby

Price per ft²$712
CheaperTypical $715Pricier

Pricier than 49% of homes nearby

Living area2,303 ft²
SmallerTypical 2,114 ft²Bigger

Bigger than 59% of homes nearby

Lot size0.14 ac
SmallerTypical 0.16 acBigger

Bigger than 33% of homes nearby

Year built1935
OlderTypical 1930Newer

Newer than 62% of homes nearby

How 21 Dean St ranks against every home in each area.
MeasureThis homeBelmont 02478Middlesex County
Estimated valuepricier than$1,638,85364% of homes91% of homes
Price per ft²pricier than$71249% of homes87% of homes
Living areabigger than2,303 ft²59% of homes68% of homes
Lot sizebigger than0.14 ac33% of homes21% of homes
Year builtnewer than193562% of homes34% of homes

About 21 Dean St

How much is 21 Dean St, Belmont, MA worth?

The TopHap Estimate for 21 Dean St, Belmont, MA is $1,638,853 as of Sep 24, 2026. The likely range is $1,555,919 to $1,721,787. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 21 Dean St, Belmont, MA last sell?

21 Dean St, Belmont, MA last sold on Feb 13, 2017, according to the county's recorded deed. TopHap holds 2 recorded sales for this parcel.

How big is 21 Dean St, Belmont, MA?

21 Dean St, Belmont, MA has 4 bedrooms, 2.5 bathrooms, 2,303 square feet of living space and a 0.14-acre lot.

When was 21 Dean St, Belmont, MA built?

21 Dean St, Belmont, MA was built in 1935, making it 91 years old. The building has 2 stories.

What schools serve 21 Dean St, Belmont, MA?

21 Dean St, Belmont, MA is assigned to Winn Brook (elementary), rated A+; Belmont High School (high), rated A+; Winthrop L Chenery Upper Elementary School (middle), rated A-. All sit in Belmont School District. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 21 Dean St, Belmont, MA compare to other homes in Belmont 02478?

Among the 7,995 homes in Belmont 02478, it is worth more than 64% of them ($1,638,853 against a typical $1,461,644), its price per square foot is higher than 49% of them ($712 against a typical $715), it is bigger than 59% of them (2,303 ft² against a typical 2,114 ft²), its lot is bigger than 33% of them (0.14 ac against a typical 0.16 ac) and it is newer than 62% of them (1935 against a typical 1930). Measured against all of Middlesex County, it is worth more than 91% of homes there. These shares are recounted nightly from the full county assessor record for each area, not from active listings.

What are the property taxes on 21 Dean St, Belmont, MA?

The 2025 property tax bill for 21 Dean St, Belmont, MA was $17,552. The county assessed it at $1,541,000.

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